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Merge pull request #26281 from kallaballa:clgl_device_discovery

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Rewrote OpenCL-OpenGL-interop device discovery routine without extensions and with Apple support
pull/24927/merge
Alexander Smorkalov 4 weeks ago committed by GitHub
parent c79b72a838 3edcf410b6
commit e026a5ad8a
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1 changed files with 123 additions and 63 deletions
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  1. 186
      modules/core/src/opengl.cpp

186
modules/core/src/opengl.cpp
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@ -42,6 +42,12 @@
#include "precomp.hpp"
#if defined (__APPLE__) || defined(MACOSX)
#define GL_SHARING_EXTENSION "cl_APPLE_gl_sharing"
#else
#define GL_SHARING_EXTENSION "cl_khr_gl_sharing"
#endif
#ifdef HAVE_OPENGL
# include "gl_core_3_1.hpp"
# ifdef HAVE_CUDA
@ -1635,94 +1641,148 @@ Context& initializeContextFromGL()
#elif !defined(HAVE_OPENCL_OPENGL_SHARING)
NO_OPENCL_SHARING_ERROR;
#else
cl_uint numPlatforms;
cl_int status = clGetPlatformIDs(0, NULL, &numPlatforms);
cl_uint platformsCnt = 0;
cl_uint devCnt = 0;
cl_device_id* devices = nullptr;
cl_uint devUsed = 0;
cl_context context = nullptr;
cl_int status = clGetPlatformIDs(0, NULL, &platformsCnt);
if (status != CL_SUCCESS)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't get number of platforms: %d", status));
if (numPlatforms == 0)
if (platformsCnt == 0)
CV_Error(cv::Error::OpenCLInitError, "OpenCL: No available platforms");
std::vector<cl_platform_id> platforms(numPlatforms);
status = clGetPlatformIDs(numPlatforms, &platforms[0], NULL);
std::vector<cl_platform_id> platforms(platformsCnt);
status = clGetPlatformIDs(platformsCnt, &platforms[0], NULL);
if (status != CL_SUCCESS)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't get number of platforms: %d", status));
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't get platforms: %d", status));
// TODO Filter platforms by name from OPENCV_OPENCL_DEVICE
bool sharingSupported = false;
int found = -1;
cl_device_id device = NULL;
cl_context context = NULL;
for (unsigned int i = 0; (!sharingSupported && (i < platformsCnt)); ++i) {
status = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_GPU, 0, NULL, &devCnt);
if (status != CL_SUCCESS)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: No devices available: %d", status));
for (int i = 0; i < (int)numPlatforms; i++)
{
// query platform extension: presence of "cl_khr_gl_sharing" extension is required
{
AutoBuffer<char> extensionStr;
try {
devices = new cl_device_id[devCnt];
size_t extensionSize;
status = clGetPlatformInfo(platforms[i], CL_PLATFORM_EXTENSIONS, 0, NULL, &extensionSize);
if (status == CL_SUCCESS)
{
extensionStr.allocate(extensionSize+1);
status = clGetPlatformInfo(platforms[i], CL_PLATFORM_EXTENSIONS, extensionSize, (char*)extensionStr.data(), NULL);
}
status = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_GPU, devCnt, devices, NULL);
if (status != CL_SUCCESS)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't get platform extension string: %d", status));
if (!strstr((const char*)extensionStr.data(), "cl_khr_gl_sharing"))
continue;
}
clGetGLContextInfoKHR_fn clGetGLContextInfoKHR = (clGetGLContextInfoKHR_fn)
clGetExtensionFunctionAddressForPlatform(platforms[i], "clGetGLContextInfoKHR");
if (!clGetGLContextInfoKHR)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't get platform devices: %d", status));
for (unsigned int j = 0; (!sharingSupported && (j < devCnt)); ++j) {
size_t extensionSize;
status = clGetDeviceInfo(devices[j], CL_DEVICE_EXTENSIONS, 0, NULL, &extensionSize );
if (status != CL_SUCCESS)
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: No devices available: %d", status));
if(extensionSize > 0)
{
char* extensions = nullptr;
try {
extensions = new char[extensionSize];
status = clGetDeviceInfo(devices[j], CL_DEVICE_EXTENSIONS, extensionSize, extensions, &extensionSize);
if (status != CL_SUCCESS)
continue;
} catch(...) {
CV_Error(cv::Error::OpenCLInitError, "OpenCL: Exception thrown during device extensions gathering");
}
std::string devString;
if(extensions != nullptr) {
devString = extensions;
delete[] extensions;
}
else {
CV_Error(cv::Error::OpenCLInitError, "OpenCL: Unexpected error during device extensions gathering");
}
size_t oldPos = 0;
size_t spacePos = devString.find(' ', oldPos); // extensions string is space delimited
while (spacePos != devString.npos) {
if (strcmp(GL_SHARING_EXTENSION,
devString.substr(oldPos, spacePos - oldPos).c_str())
== 0) {
// Device supports context sharing with OpenGL
devUsed = i;
sharingSupported = true;
break;
}
do {
oldPos = spacePos + 1;
spacePos = devString.find(' ', oldPos);
} while (spacePos == oldPos);
}
}
}
} catch(...) {
CV_Error(cv::Error::OpenCLInitError, "OpenCL: Exception thrown during device information gathering");
if(devices != nullptr) {
delete[] devices;
}
continue;
}
cl_context_properties properties[] =
{
#if defined(_WIN32)
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
CL_GL_CONTEXT_KHR, (cl_context_properties)wglGetCurrentContext(),
CL_WGL_HDC_KHR, (cl_context_properties)wglGetCurrentDC(),
if (sharingSupported) {
// Define OS-specific context properties and create the OpenCL context
#if defined (__APPLE__)
CGLContextObj cglContext = CGLGetCurrentContext();
CGLShareGroupObj cglShareGroup = CGLGetShareGroup(cglContext);
cl_context_properties props[] =
{
CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE, (cl_context_properties)cglShareGroup,
0
};
context = clCreateContext(props, 0,0, NULL, NULL, &ciErrNum);
#elif defined(__ANDROID__)
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
CL_GL_CONTEXT_KHR, (cl_context_properties)eglGetCurrentContext(),
CL_EGL_DISPLAY_KHR, (cl_context_properties)eglGetCurrentDisplay(),
cl_context_properties props[] =
{
CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties)glXGetCurrentDisplay(),
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
0
};
context = clCreateContext(props, 1, &devices[devUsed], NULL, NULL, &status);
#elif defined(_WIN32)
cl_context_properties props[] =
{
CL_GL_CONTEXT_KHR, (cl_context_properties)wglGetCurrentContext(),
CL_WGL_HDC_KHR, (cl_context_properties)wglGetCurrentDC(),
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
0
};
context = clCreateContext(props, 1, &devices[devUsed], NULL, NULL, &status);
#elif defined(__linux__)
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties)glXGetCurrentDisplay(),
cl_context_properties props[] =
{
CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties)glXGetCurrentDisplay(),
CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i],
0
};
context = clCreateContext(props, 1, &devices[devUsed], NULL, NULL, &status);
#endif
0
};
// query device
device = NULL;
status = clGetGLContextInfoKHR(properties, CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR, sizeof(cl_device_id), (void*)&device, NULL);
if (status != CL_SUCCESS)
continue;
}
// create context
context = clCreateContext(properties, 1, &device, NULL, NULL, &status);
if (status != CL_SUCCESS)
{
clReleaseDevice(device);
}
CV_Error_(cv::Error::OpenCLInitError, ("OpenCL: Can't create context for OpenGL interop: %d", status));
else
{
found = i;
break;
}
}
if (found < 0)
CV_Error(cv::Error::OpenCLInitError, "OpenCL: Can't create context for OpenGL interop");
cl_platform_id platform = platforms[found];
cl_platform_id platform = platforms[devUsed];
std::string platformName = PlatformInfo(&platform).name();
OpenCLExecutionContext clExecCtx = OpenCLExecutionContext::create(platformName, platform, context, device);
clReleaseDevice(device);
OpenCLExecutionContext clExecCtx = OpenCLExecutionContext::create(platformName, platform, context, devices[devUsed]);
clReleaseDevice(devices[devUsed]);
clReleaseContext(context);
clExecCtx.bind();
return const_cast<Context&>(clExecCtx.getContext());

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